SOLUTION: How many multiples of 3 less than 100 can be formed from the digits 1 4 5 7 8 (hint: the sum of the digits of any multiple of 3 is also a multiple of 3.)

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Question 871900: How many multiples of 3 less than 100 can be formed from the digits 1 4 5 7 8
(hint: the sum of the digits of any multiple of 3 is also a multiple of 3.)
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
There are 12 using just those 5 digits
15 18 45 48
51 54 57 75
78 81 84 87